LED retrofit lamp
a technology for retrofitting lamps and led lamps, which is applied in the direction of lighting safety devices, semiconductor devices for light sources, lighting and heating apparatus, etc., can solve the problems of no hf signal, no regular or sufficient hf signal, and devices that remain non-conducting, and achieve the effect of less cos
Active Publication Date: 2016-08-04
SIGNIFY HLDG BV
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Benefits of technology
The LED lamp described in the patent has several features: it can be connected to a mains current, has its own control unit to set the brightness and color, and includes safety features to prevent electrical shock. The control unit can change the state of the switching devices to insulate the lamp from the mains current and can regulate the voltage to set the first and second relays. This allows for a simple and cost-effective setup of the LED lamp.
Problems solved by technology
If on the other hand, only one end of the tube lamp is inserted into the fixture, in most cases no HF signal is generated by the ballast and in some cases no regular or sufficient HF signal is provided on the mains current line and the first and second switching devices remain non-conducting.
That is to say, some ballast generates some ignition voltage in the situation when the lamp is connected to the “hot” side of the ballast output, but such ignition voltage will only last for a short time.
Method used
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[0059]FIG. 1 shows schematically and exemplarily an example of a conventional TL-tube. Conventional TL tube lamps are safe due to the fact that the gas inside the tube first has to be ignited before there is a conducting path between the two connections on the end of the tube. Ignition is carried out via a combination of starter and ballast or a HF generated high voltage. This safety is necessary when the tube is being installed into a fixture while the voltage is not disconnected from the mains. In the situation when the lamp is not inserted correctly (e.g., one side inserted and the other not yet), the one side of the lamp is connected to live mains and the electrical contacts of the other side are insulated from the live mains As illustrated by FIG. 1, the pins of a conventional TL-Tube are safe to touch.
[0060]However, upon using LED-based lamps, such as LED-based retrofit lamps, there is a conducting path between the electronics in the two ends of the tube. Thus, safety is not g...
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The present invention relates to an LED retrofit lamp (700) adapted for operation with an alternating current. The LED lamp comprises an LED unit (740), a mains current line, first and second switching devices (710, 720) (e.g., first and second relays), and a control unit (730). The control unit (730) detects an ignition voltage on the mains current line. In response to detecting the ignition voltage on the mains current line, the control unit (730) sets the first and second switching devices (710, 720) to a conducting state such that the LED unit (740) is connected to power. By using the first and second switching devices (710, 720), safety of the LED lamp (700) is improved, in particular when installing the lamp (700) into a fixture designed for fluorescent lamps.
Description
FIELD OF THE INVENTION[0001]The invention relates to an LED retrofit lamp and to a method of operating an LED retrofit lamp with an alternating current.BACKGROUND OF THE INVENTION[0002]WO2012127371A1 discloses an electric lamp having two pairs of external connection pins adapted for connecting the lamp to a voltage source for powering an internal lighting module. Each pair of pins is disconnected from the lighting module by an open switch unless a non-zero electric voltage is applied to the pair and causes the switch to close. The lamp may be fitted in a switch-start fixture, providing an ohmic connection between two pins in different pairs, as well as a rapid-start fixture, with a capacitive connection.[0003]Further measures might become necessary in order to meet increasing safety requirements for LED retrofit lamps.SUMMARY OF THE INVENTION[0004]It is an object of the present invention to provide an LED retrofit lamp meeting reinforced insulation requirements. It is a further obje...
Claims
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IPC IPC(8): H05B33/08F21V25/04F21K99/00H05B44/00
CPCH05B33/0884H05B33/0809H05B33/0803F21V25/04F21K9/27H05B33/0842Y02B20/383Y02B20/386F21V23/06F21K9/278Y02B20/30H05B45/3578H05B47/26H05B45/00
Inventor ACKERMANN, BERNDTAO, HAIMINSAUERLAENDER, GEORGVAN DIJK, BERNHARD CHRISTIAANSU, BORONG
Owner SIGNIFY HLDG BV